Miter-cutter



2 Sheets-Sheet 1.

( o Model.)

w. R. POX. MITER GUTTBR,

Patented'June 21, 1892.

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(No Model.)

2 Sheets-Sheet 2. W. R.-POX.

MIIBR GUITER. I No. 477,526.. Patented June 21; 1892.

o w J g Zia/"226852" WzZZcanz 75.1506 7 NITED STATES PATENT FFICE.

\VILLIAM R. FOX, OF GRAND RAPIDS, MICHIGAN.

MlTER-CUTTER.

SPECIFICATION forming part of Letters Patent No. 477,526, dated June 21,1892.

Application filed July 29, 1891.

To a. whom it may concern:

Be it known that I, \VILLIAM R. FOX, a citizen of the United States ofAmerica, residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented certain new and useful Improvements inMiter-Cutters, of which the following is a specification.

. My object is to provide simple and effective means for holding andguiding the gage so that the shearing-edge thereof will always lie closeto the path of the knife in whatever position the gage may be adjusted.

My invention therefore includes as its main feature a guideway or slotformed upon or in the frame of the machine, with which engages a pivotprojection on the gage, so that as the gage is turned in adjusting it toits various positions its movement will be controlled to maintain theshearing-edge at the path of the knife.

In machines of this class it is highly important that the strainresulting from the pressure of the knife will be sustained by thestandard or post of the machine, in order to relieve the gage, and Ihave therefore constructed this machine with this essential feature inview, the gage in all its positions hearing vertically along thestandard or post, and thus being accurately and securely held againstthe lateral strain from the knife. I have also specially arranged thetop cross-bar of the machine so that the space in rear and above theknife will be entirely free from projections and clear to receive thematerial close to the knife for making slight bevel cuts.

In the drawings, Figure 1 is a plan view of the bed of the machine andthe gage. Fig. 1 is a detail View showing the triangular shape of thewings for shielding the knife. Fig. 2 is a similar view showing the linkconnection to the gage. Fig. 3 is an elevation, partly in section. Figs.4 and 5 are detail views.

The general form and structure of the machine are similar to that shownby me in Patent No. 435,219, granted August 26, 1890, and need not beparticularly described, further than to indicate that A is the machineframe or bed, B the posts or standards at the ends of the knifeway, andA are the gages. As in my former patent, these gages are arranged tobear laterally along the posts B, and in adjusting the gage to itsvarious angular posi- Serial No. 401,058. (No model.)

tions the edge 1 bears upon and moves along the face of the post, and atall times the strain resulting from the pressure of the knife issustained by the post throughout the vertical extent of the gage. Therear end of the gage has a jam-nut 2, which travels in a curved slot 3in the machine-bed and by which the gage when adjusted to properposition may be fixed. This slot and nut do not determine the positionof the shearing-edge 4, but serve only to hold the rear end of the gage.

In order to control or guide the movement of the gage so that theshearing-edge 4 will be always in the path of the knife, a guidingconnection is formed between the horizontal meeting faces of the gageand the machineframe. This connection consists of a guide- Way D,preferably in the form of a slot or groove, and the pin 5, upon whichthe gage pivot-s when being adjusted, the pin projecting into the slot.This pin is provided with a sliding block 5*, accurately fitted to theslot. The center of the pivot is equally distant from the sides of thegage, and the front 6 and the slot is formed on an incline, the centralline thereof, as at L, coinciding with the miter-line drawn from theinner corner of the gage through the pin, equally dividing the rightangle between the bearing-face of the post and the line of out. Fromthisconstruction it will be clear that as the gage is adjusted or turnedon its pivot the edge 1 bears upon and moves along the face of the post,as shown, and the sliding block with the gage-pivot travels in theinclined slot to the position indicated on the left of Fig. 1, and thiscontrols the movement in such a manner as to maintain the shearing-edge4 always on the line M M, along which the carriage 11*, with the knife,moves, and this is true even should the gage be adjusted to the fullninety degrees from its normal position. (Shown in full lines on theright of Fig. 1.)

I do not wish to limit myself to the precise position of the guiding-Wayshown nor to the precise form of said guideway, nor doI wish to beunderstood as being compelled to use the sliding block shown, thoughthis is desirable on account of its reducing the liability of lostmotion in the gage.

In Fig. 2 I show a link 1, combined with the gage, and guiding meansalready de IOO eess :r to receive the end thereof.

scribed. The link is pivoted at E to an adjustable ear F, secured to thepost 13 by a screw passing through a slot, and it is pivoted to the gageby the same pin which forms the pivot thereof and passes into thesliding block. The link is above the plane of the bed, and the gage isformed with a slot or re- This link also serves to control the movementof the gage, and, together with the inclined guideway, insures a perfectaction. It is desirable that the pivot E of the link shall be on alinedrawn from the corner 4 of the gage through the gage-pivot. Theadjustment of the ear F with the pivot E makes it convenient to set theshearing-edge at a proper distance from the knife. The movement of thefree end of the link is so slight that in practice it does not movematerially from a straight line, and therefore moves with the pivot inthe slot.

It is often found desirable or necessary to make a very slight bevel cutfrom the end of a piece of wood, andin order to do this the materialmust extend vertically and nearly perpendicular from the bed of themachine close to the knife. I have therefore arranged the cross-bar 10,which forms the upper knifeway, so that its rear face 11 will bepractically even with ora little forward of the rear face of the knifeand the cutting-edge. This will allow the piece of Wood when set uprightto be at the line of the out, and by tilting it very slightly its lowerend will cross the line of cut and a bevel of slight angle may thus beformed. In other words, the crossbar is free from projections whichwould obstruct the space in rearof the knife, and this is left entirelyclear above the knife for allowing the material to be placed close tothe cuttingedge. By having the rear face of the frame slightly forwardof the knife-edge the whole of said edge is brought into action incutting.

In order to prevent the upper end of the knife from springing out, Ihave formed a groove a in the top bar and rabbeted the upper end of theknife, thereby fitting it to the groove, in which it travels and is heldagainst lateral deflection. This is shown in Fig. 5, in which the flange15 bears against the shoulder 16, formed on the knife.

In Fig. 4 the flange 15 is beveled, while the upper edge of the knife isformed to correspond thereto.

' In Fig.1 projecting wings 12 are shown as extending from the mainframe in a plane parallel with and close to the face of the knife, andthese wings extend a little beyond the extreme point of the knifesmovement in either direction. These wings act as shields and prevent theknife-edge from being exposed when in either extreme position, and thusthere is no liability of theoperator being cut accidentally by reason ofthe edge of the knife projecting beyond the frame. The Wings aretriangular in shape, their outer edges being inclined to conform to theincline of the cutting-edge. They are provided with ribs 13 about theiredges on the face adjacent to the knife, and these aid in shielding theknife.

I claim as my invention 1. In a miter-cutter, agage having ashearing-edge, a post forming a bearing for the gage, and a guidingconnection between the horizontal meeting faces on the gage, and frameautomatically adjustable in the movement of the gage, so as to cause theshearingedge to move along the line of the cut, substantially asdescribed.

2. In a miter-cutter,a gage having a shearing-edge, a post forming abearing for the gage, the inclined guideway between the gage and themachine-frame, the pivot-pin engaging said guideway and automaticallyadjustable in the movement of the gage to cause the shearing-edge tomove along the line of the cut, substantially as described.

3. In a miter-cutter, the combination of a gage having a shearing-edge,a post forming abearin g therefor, a guideway in the machinebed, and apivot-pin projecting from the lower face of the gage engaging theguideway and automatically adjustable therein in the movement of thegage, substantially as described.

l. In a miter-cutter, the combination of a gage having a shearing-edge,a post forming a bearing for the gage, the inclined guideway adjacent tothe shearing'edge, the pivotpin, and the sliding block in the guideway,substantially as described.

5. In a miter-cutter, the combination ofa gage having a shearing-edge,the guideway and pin connection between the gage and the machine-frameadjacent to the shearingedge, and the pivoted link connected to the gageand said frame, substantially as described.

G. In a miter-cutter, the combination of the gage having ashearing-edge, the guideway adjacent to the shearing-edge, the link, andthe pivot-pin passing through the link into the inclined. guideway,substantially as described.

7. In a miter-cutter, the combination of the gage having a shearing-edgeand the link pivoted to the machine-frame and to the gage, the rear oneof said pivots being adjustable toward and from the line of cut,substantially as described.

8. In a miter-cutter, the combination of the machine-bed, the knife, thegages and posts, and the top cross-bar having its rear face free fromprojectionsin rear of the knife, substantially as described. 7

9. In combination, the frame having a top bar 11, extending across themachine, with'a guideway for the knife, the carriage having the knifeand moving in suitable Ways, and the knife having its upper edge held bythe guideway throughout its movement, whereby the knife will be heldagainst springing as it enters the Wood at any point in its travel,substantially as described. 7

10. In combination, the frame, the movable IIC knife, and the stationaryshields projecting from and beyond the frame and adjacent to the path ofthe knife, substantially as deright angles to the line of cut, the gagehaving an edge bearing against said face, and means for controlling themovement of the gage and maintaining its shearing-edge at the line ofthe cut, consisting of a gnideway extending at an angle to the line ofout and the bearingface of the post, and a pin engaging said guidewayand automatically adjustable along the same in the movement of the gage.

In testimony whereof IafliX my signature in presence of two witnesses.

XVILLIAM R. FOX.

WVit-n esses:

GEO. G. WHITWORTH, CHAS. F. Root).

